443664381 has 8 divisors (see below), whose sum is σ = 596068704. Its totient is φ = 293518160.

The previous prime is 443664379. The next prime is 443664413. The reversal of 443664381 is 183466344.

It is a happy number.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 443664381 - 2¹ = 443664379 is a prime.

It is a super-2 number, since 2×443664381² = 393676165936226322, which contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (443664311) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 564066 + ... + 564851.

It is an arithmetic number, because the mean of its divisors is an integer number (74508588).

Almost surely, 2^443664381 is an apocalyptic number.

It is an amenable number.

443664381 is a deficient number, since it is larger than the sum of its proper divisors (152404323).

443664381 is a wasteful number, since it uses less digits than its factorization.

443664381 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1129051.

The product of its digits is 165888, while the sum is 39.

The square root of 443664381 is about 21063.3421137292. The cubic root of 443664381 is about 762.6960920374.

The spelling of 443664381 in words is "four hundred forty-three million, six hundred sixty-four thousand, three hundred eighty-one".